MRP setup

I am currently setting up MRP with our companies GP9 software and have ran into one little snag, it is not calculating/taking into acount capacity. I currently have the Foercast module set up and working, and all the information entered into the BOM"s and in the Item Resource planning fileds (mfg leadtime, shrinkage and order qty modifiers) and as far as i can see it is all working, i simply enter int he forecast for Parent item intot he Forecast Module, regenrate MRP and it creates all the parent MO's along with all the sub-assembly MO's and are accurate in accordance tot he mfg leadtime and max builds sizes. However, it is not taking capacity into acount and just creates all the parent MO's on 1 date and all the sub-assembly MO's on another date based off of mfg leadtime.
Ex; X=parent item; has mfg leadtime of 5 working days, and a max build size of 100
Y=sub-assembly; has mfg leadtime of 5 working days, a max of build size of 100
Forcast for Nov 1 = 400 units
So instead of creating 4 parent MO's to start on Oct 25, 18, 11 and 4 and 4 Sub MO's to start on Oct 18, 11, 4, and Sept 27, it is creating 4 parent MO's to start on Oct 25 and 4 sub MO's to start on Oct 18.

Is there anyway to incorporate Capcaity into this MRP so that the MO's are created correctly? I know this can be handled using the MPS module, however we do not have that module, so i was hoping there was a way around it?

Dynamics GP follows APICS conventional MRP logic which assumes " infinite capacity ".
The MPS module loads a Demand schedule of "Independent " items which MRP explodes to calculate the " Dependent " demand item schedules.
You would need the CRP module to "test" the MRP plan for overloading.
Even then, CRP does not smooth the load!. It only shows the effect of the schedules on work center capacity